Teustees



(No Model.)

A. LPABOELLE.

v HAND WHEEL FOR SEWING MACHINES.

No. 247,898. Patented Sept. 20,1881.

' bolt, to make the pulley either fast or loose UNITED STATES? PATENT emcee ALBERT L. PAROELLE, OF BOSTON, ASSIGNOR TO A. B. COFFIN, OF WIN- CHESTER, ONSLOW' GILMORE, OF STONEHAM, AND BENJAMIN A. FOW- LER, OF STONEHAM, MASSACHUSETTS, TRUSTEES.

HAND-WHEEL FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 247,398, dated. September 20, 1881.

Application filed March 15, 1881.

shaft in the machine head or neck which oper- V ates the stitch-formic g mechanism is provided with an enlarged offset periphery or handwheel for operating a bobbin-winder, and is adapted to be released, so as to move loosely upon the shaft, and thereby operate the bobbin-winder without operating the driving-shaft and the stitch-forming mechanism.

The invention has for its object to provide simple and effective means for enabling the operator, byavery slight movement of a screwupon its shaft.

To this end the invention consists in the combination, with a loose pulley having an internal annular surface, of a shaft having radial guides, locking-arms movable in said guides and adapted to move endwise against the annular surface, and a wedge-bolt adapted to be moved longitudinally in a socket formed in the shaft and force the locking-arms outwardly against the annular surface, thereby making the pulley fast upon the shaft.

The invention also consists in the provision of a spring to automatically retract the locking-arms when the wedge-bolt is retracted, all of which I will now proceed to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a longitudinal section of a portion of the driving-shaft of a sewing-machine having a driving-pulley and hand-wheel and a clutch mechanism embodying my invention. Fig. 2 represents a section on the line or m, Fig. 1.

The same letters of reference indicate the same parts in both figures.

In the drawings, (t represents a portion of the head or neck of a sewing-machine.

1) represents the rear end of the driving-shaft (No model.)

which actuates the stitch-forming mechanism, and isjournaled in the neck a, as usual.

crepresents the driving-pulley, which rotates the shaft 1), and is connected by a belt to the main driving-wheel of the machine.

d represents the hand-wheel, which consists of an enlarged periphery or rim offset from the pulley c, and rigidly attached to or forming an integral part of the latter. The pulley c is chambered out on one side to form an internal annular surface, 0. 1

cl d represent guides or sockets radiating from the center of the shaft b toward the annular surface 0. The outer portions of said guides are preferably formed in a collar, 1), rigidly attached to the shaft b. 6

c 6 represent locking-arms located in the guides d d, and movable therein toward and from the surface 0. These arms are adapted to bear at their outer ends against the surface 0, and maybe of any desired form, the T shape shown in Fig. 2 being preferred, theouter side of the cross-piece being curved to tit the curvature of the surface 0.

frepresents a wedge-bolt, which is located in a longitudinal socket, g, in the shaft 1), and

is provided with a tapering or conical inner end interposed between the inner ends of the arms 6 e. The boltfis threaded atits outer end and engaged with a correspondingly-threaded portion of the socket 9, so that when the bolt is rotated it is moved longitudinally. If the movement of the bolt is in one direction, its tapering end will act as a wedge and move or project the arms 0 outwardly, causing the heads ofsaid arms to bear on the surfaces 0, and thus looking the pulley upon the shaft. If the movement of the bolt is in the opposite direction, it releases the arms 0 and makes the pulley loose.

ircpresents a spring, connecting the arms e c, and adapted to retract said arms and separate them from the surface 0 when they are released.

j represents an enlarged head on the outer end of the wedge-boltf, said head being at the end of the shaft 1), and constituting a handle for the operator to grasp in turning the bolt.

It will be seen that the locking-arms maybe moved to lock or release the pulley by a very slight rotary movement of the boltf, and that when said arms are projected they are firmly held by the wedge-bolt, and constitute a strong and efficient means for connecting the shaft and pulley.

Havingthus described inyinvention, what 1 claim, and desire to secure by Letters Patent, 1s

1. The loose pulley 0, having an internal annular surface, 0, the shaft I), constructed with guides or sockets d d, and the arms a 0, arran gedin said guides,combinedwith the Wedgebolt f, arranged in a longitudinal threaded socket in the shaft, and adapted to operate the locking-arms e e, substantially as shown and described.

2. The combination of the chambered pulley c, spring-arms e 0, arranged in suitable guides, d cl, and ,the operating-boltf, provided With the head j, all constructed and arranged substantially as shown and described.

In testimony whereof I have signed my name to this specification, in the presence oftwo subscribing Witnesses, this 24th day of February, A. D. 1881.

ALBERT L. PARCELLE.

Witnesses:

G. I. BROWN, H. G. WADLIN. 

